[tor-bugs] #28290 [- Select a component]: Stop lying that "reporting real OS in navigator.userAgent is not a bug"

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#28290: Stop lying that "reporting real OS in navigator.userAgent is not a bug"
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 Reporter:  indigotime  |          Owner:  (none)
     Type:  defect      |         Status:  new
 Priority:  Very High   |      Component:  - Select a component
  Version:              |       Severity:  Normal
 Keywords:              |  Actual Points:
Parent ID:              |         Points:
 Reviewer:              |        Sponsor:
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 Reporting real operating system in navigator.userAgent **is a bug**
 because of the following:

 1. Since you introduced this anti-privacy feature (by "anti-privacy
 feature" I mean reporting real OS in navigator.userAgent property), **you
 must** provide a way to disable it. Otherwise it looks like an
 **intentional action against all Tor Browser users who want to keep their
 privacy protected**. Users may want to stop reporting real OS. Users
 didn't gave you a permission to decide it for them.
 There are many websites which rely on navigator.userAgent and don't use
 any other fingerprinting methods. Currently Tor Browser users can't stop
 them from reading real OS version from navigator.userAgent. It's a bug,
 and it's must be fixed.

 2. According to specifications, navigator.userAgent must be equal to HTTP
 User-Agent header.
 https://html.spec.whatwg.org/multipage/system-state.html#dom-navigator-
 useragent
 https://fetch.spec.whatwg.org/#default-user-agent-value
 Any difference between HTTP User-Agent and navigator.userAgent is spec
 violation.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28290>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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